Alternating Current questions
577 published questions with worked solutions.
- In an LCR circuit at resonance, the a.c. source current is (A) maximum in a series LCR circuit only. (B) maximum in a parallel...
- An alternating voltage e = 150 2 100 ,t volt is applied to a capacitor of capacity 2 , . The root mean square value of current in...
- For a series LCR circuit inductive reactance X_L is equal to resistance R and also equal to twice the capacitive reactance X_C....
- An a.c. e.m.f. of peak value = 230 V and frequency 50 Hz is connected to a circuit with R = 11.5 , L = 2.5 H and a capacitor all...
- An e.m.f. e=E_0 t is applied to a circuit containing L, C and R in series where X_L=3R and X_C=R. The average power dissipated in...
- An ideal transformer converts 220 a.c. to 3.3 kV a.c. to transmit a power of 4.4 kW. If primary coil has 600 turns then...
- A 20 , resistance, 10mH inductance coil and 15 capacitor are joined in series. When a suitable frequency alternating current...
- A resistance of 200 , and an inductor of 1 2 H are connected in series to a.c. voltage of 40 V and 100 Hz frequency. The phase...
- A current of 4 A is flowing at 230 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2300...
- In a L-R circuit of 4 mH inductance and 3 resistance, e.m.f. E = cos(1000t)V is applied. The amplitude of current is
- In an LCR series circuit an alternating voltage source of frequency 'F' is connected. The current leads the voltage by 45^o. The...
- When an inductance 'L' and resistor R are connected in series to 25V, 50 Hz supply, a current of 0.5 A flows in the circuit. The...
- In a series LCR circuit, the voltage across R is 100 V, R = 1 K and C = 2 . The angular frequency is 200 rad s^ -1 . At...
- An ideal inductor of ( 1 ) H is connected in series with a 300 resistor. If a 20 V, 200 Hz alternating source is connected across...
- A coil has inductance 2 H. The ratio of its reactance when it is connected first to an a.c. source and then to a d.c. source is
- When alternating current is passed through L-R series circuit, the power factor is 3 2 and R= 50 , then the value of L is [ 6= 3...
- An a.c. e.m.f. of peak value 230 V and frequency 50 Hz is connected to a circuit with R = 11.5 , L = 2.5 H and a capacitor all in...
- If the power factor changes from 0.5 to 0.25 because impedance changes from Z_1 to Z_2 then Z_1 = x Z_2. The value of x is...
- Same current is flowing in two different a.c. circuits. First circuit contains only inductance and second contains only...
- In an LR circuit, the value of L is ( 0.3 ) henry and the value of R is 40 , If in the circuit, an alternating e.m.f of 230 V at...
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